diff --git a/edit.html b/edit.html
index ee6b2fa3..2826b6bf 100644
--- a/edit.html
+++ b/edit.html
@@ -5,7 +5,7 @@
 
     <style id="firefox-transitions-bug-suppressor">
       /* restrict to FF */
-      @-moz-document url-prefix("") {
+      @supports (-moz-appearance:none) {
         /* increased specificity to override sane selectors in user styles */
         html#stylus.firefox #stylus-edit #header *,
         html#stylus.firefox #stylus-edit #sections * {
diff --git a/edit/codemirror-default.css b/edit/codemirror-default.css
index 5bf391a9..72370f4c 100644
--- a/edit/codemirror-default.css
+++ b/edit/codemirror-default.css
@@ -18,7 +18,7 @@
   outline: -webkit-focus-ring-color auto 5px;
   outline-offset: -2px;
 }
-@-moz-document url-prefix("") {
+@supports (-moz-appearance:none) {
   /* restrict to FF */
   .CodeMirror-focused {
     outline: #7dadd9 auto 1px;
diff --git a/manage.html b/manage.html
index 30233644..cd0e04a5 100644
--- a/manage.html
+++ b/manage.html
@@ -13,7 +13,7 @@
 
   <style id="firefox-transitions-bug-suppressor">
     /* restrict to FF */
-    @-moz-document url-prefix("") {
+    @supports (-moz-appearance:none) {
       /* increased specificity to override sane selectors in user styles */
       html#stylus.firefox #stylus-manage #header * {
         transition: none !important;
diff --git a/options.html b/options.html
index 4180a5de..822aca89 100644
--- a/options.html
+++ b/options.html
@@ -9,7 +9,7 @@
 
   <style id="firefox-transitions-bug-suppressor">
     /* restrict to FF */
-    @-moz-document url-prefix("") {
+    @supports (-moz-appearance:none) {
       /* increased specificity to override sane selectors in user styles */
       html#stylus.firefox #options *, #stylus #notes * {
         transition: none !important;
diff --git a/popup.html b/popup.html
index f844adbf..4df2ce89 100644
--- a/popup.html
+++ b/popup.html
@@ -7,7 +7,7 @@
 
   <style id="firefox-transitions-bug-suppressor">
     /* restrict to FF */
-    @-moz-document url-prefix("") {
+    @supports (-moz-appearance:none) {
       /* increased specificity to override sane selectors in user styles */
       html#stylus.firefox #stylus-popup #actions * {
         transition: none !important;